Characteristics of Dust in Coal Mines in Central North China and Its Research Significance.

ACS Omega · 2020 · PMC7191605 · PMID 32363275

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a decreasing trendno p-value reported

There is a decreasing trend of PM10 proportion from the air intake roadway to the working face, to the return air roadway.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.